Rotor of axial gap motor and method of producing same

Abstract

A rotor of an axial gap motor has a circular rotor core. A circular frame member is put on one axial face of the circular rotor core. The frame member has a plurality of magnet receiving recesses that are circularly arranged about the axis of the circular frame member at evenly spaced intervals. A plurality of permanent magnets are received in the magnet receiving recesses. A connecting structure connects the circular rotor core and the circular frame member together.

1. A rotor of an axial gap motor with two stators arranged to accept the rotor therebetween, comprising:
 a circular rotor core; 
 first and second circular frame members put on axially opposed faces of the circular rotor core, each frame member having a plurality of magnet receiving recesses that are circularly arranged about an axis of the circular frame member at evenly spaced intervals; 
 a plurality of permanent magnets respectively received in the magnet receiving recesses of the first and second circular frame members, the permanent magnets on each frame member being arranged changing the magnetic N/S poles alternately; and 
 a connecting structure that connects the circular rotor core and the first and second circular frame members together, 
 wherein the connecting structure comprises: 
 first connecting bolts passing through the rotor core and the first and second frame members for connecting the same together, the first connecting bolts being secured to a connecting ring that is adapted to be mounted on a rotor shaft of the axial gap motor; and 
 second connecting bolts that pass through the rotor core and the connecting ring and are secured to a raised portion of the rotor shaft. 
 
   
   
     2. A rotor as claimed in  claim 1 , in which the circular rotor core is made of a magnetic material and the first and second circular frame members are made of a non-magnetic material. 
   
   
     3. A rotor as claimed in  claim 2 , in which at least one of the first and second circular frame members is partially cut or shaved to obtain a properly balanced rotation of the rotor relative to the stators of the motor. 
   
   
     4. A rotor of an axial gap motor with two stators, comprising:
 a circular rotor core of a magnetic material; 
 first and second circular frame members of a non-magnetic material, the first and second circular frame members being put on axially opposed faces of the circular rotor core, each frame member having a plurality of magnet receiving recesses that are circularly arranged about an axis of the circular frame at equally spaced intervals; 
 a plurality of permanent magnets respectively received in the magnet receiving recesses of the first and second circular frame members, the permanent magnets on each frame member being arranged changing the magnetic N/S poles alternately, the permanent magnets being of a sintered type; and 
 a connecting structure that connects the circular rotor core and the first and second circular frame members together, wherein the connecting structure comprises either one of a brazed portion and welded portion by which the rotor core is secured to the first and second frame members.